freebsd-skq/contrib/compiler-rt/lib/lshrdi3.c
ed 870837e3e9 Import libcompiler_rt into HEAD and add Makefiles.
Obtained from:	user/ed/compiler-rt
2010-11-11 15:13:11 +00:00

42 lines
1.1 KiB
C

/* ===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __lshrdi3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: logical a >> b */
/* Precondition: 0 <= b < bits_in_dword */
di_int
__lshrdi3(di_int a, si_int b)
{
const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
udwords input;
udwords result;
input.all = a;
if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
{
result.s.high = 0;
result.s.low = input.s.high >> (b - bits_in_word);
}
else /* 0 <= b < bits_in_word */
{
if (b == 0)
return a;
result.s.high = input.s.high >> b;
result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
}
return result.all;
}